My favorite classic novel is Water Margin.

This compound contains a sulfhydryl group.

Kazumi is my best friend.

I have been to Suishiei.

Water Margin is one of the four great literatures of China.

I buy water at the water store every day.

Groundwater pollution has become a serious environmental problem.

I saw various aquatic creatures at the aquarium.

He crossed many mountains and rivers to meet her.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.